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[Role of Mycobacterium tuberculosis in bovine tuberculosis].

The authors report the results of a survey on the possible role of human Mycobacterium in the ganglio-pulmonary tuberculosis of bovines. 232 bovines seized in the abattoirs of Algiers over a period of 8 months were concerned by this work. The results obtained showed that microscopic examination was negative in 50% of cases. This result was expected as ganglionary lesions are paucibacillary. Cultures were also negative in 50% of cases, 25% of them were contaminated. 50% rate of positive cultures was obtained when Loewenstein-Jensen medium with 1% pyruvate was used. Morphological and biochemical identification showed that out of 113 strains, 7 were Mycobacterium tuberculosis (6.2%). In seems therefore that Mycobacterium tuberculosis, human pathogen, is also pathogenic for bovines. Its frequent occurrence could be explained by the high prevalence of human tuberculosis in Algeria.

Animals↗
PubMed1979

Laboratory diagnosis of bovine tuberculosis.

Lesions of suspected bovine tuberculosis were examined by culture, histopathology and auramine-O (AO) stained smears and the findings correlated with field aspects of the disease. Of 642 lesions considered to be tuberculous, 62.0% yielded M. bovis and 4.5% other mycobacteria (OM). M. bovis and OM were recovered also from 0.6% and 3.6% respectively of 165 cattle which gave tuberculin reactions but had no visible lesions at slaughter. Of 262 lesions in which a histopathological diagnosis other than tuberculosis was made, 1.5% and 3.0% yielded M. bovis and OM respectively. All OM isolates tested belonged to the Mycobacterium-avium-intracellulare-scrofulaceum (MAIS) complex with a predominance of serotype 2. A good relationship was found between the recovery of mycobacteria and histopathology but examination of smears revealed 22.0% apparent false negatives. Apparent false negative culture results were also reported for 35.8% of lesions positive on histopathology and smear examination. The majority of herds yielding M. bovis contained reactors to the tuberculin test and many of these had lesions of tuberculosis. In contrast, herds yielding OM seldom contained reactors to the tuberculin test and rarely reactors with tuberculous lesions. The thoracic cavity was the main site of lesions from infections by M. bovis and OM.

Animals↗
PubMed1977

Serological responses in experimental bovine tuberculosis.

Five two-year-old heifers were each inoculated intravenously with 0.02 mg M. bovis strain AN5. Clinical, haematological and microbiological observations were made during the course of the experiment and antibody levels were measured before and after infection by means of the indirect immunofluorescent antibody (IFA) and bentonite flocculation tests. All cattle developed M. bovis infection varying in severity from peracute tuberculous pneumonia resulting in death within 33 days to chronic progressive generalised tuberculosis. Only cattle developing peracute or acute forms of tuberculosis showed marked haematological changes characterised by leucopenia with lymphopenia. Bacteraemia was detected in the two cattle with peracute tuberculosis 22 days after infection. Anti-mycobacterial antibody was detected after infection in all cattle but fluctuated markedly during the course of the disease. Of a total of 61 serum samples examined from all cattle after inoculation with M. bovis, only 38 were positive to the IFA test and 30 to the bentonite flocculation test. Only 18 were positive to both tests at any one time. IgM was the predominant type of anti-mycobacterial antibody detected by the IFA test and this was found to cross-react with M. avium in almost every sample.

Animals↗
PubMed1975

An epizootic of bovine tuberculosis in Georgia.

A tuberculous beef animal was detected Aug 29, 1973, by a veterinary medical officer in a Georgia slaughter establishment. Animal identification and traceback eventually led to a purebred beef herd in Decatur County, Georgia. Investigation and tuberculin testing of 23,000 cattle in 350 herds revealed 11 Mycobacterium bovis-infected beef herds and resulted in the complete depopulation of 5 herds. The epizootic was confined to Georgia and was eradicated by April, 1975.

Animals↗
PubMed1979

Bovine tuberculosis in the United States and Puerto Rico: a laboratory summary.

Mycobacteria were isolated from 14.3% of the tissues submitted to the National Veterinary Services Laboratories over a 5-year period (July 1, 1972, to June 30, 1977). The isolates were identified by drug susceptibility, and biochemical and serologic tests. Mycobacterium bovis isolated from tissues of cattle originating in 32 states and Puerto Rico accounted for 78% of the acid-fast isolations. Of the Mycobacterium bovis isolates, 4% were from tissues in which no microscopic tuberculous granulomas were observed on examination of tissue sections. Of the 119 Mycobacterium avium isolates, 18 were serotype 1, 44 were serotype 2, and 45 isolates represented 12 other serotypes.

Animals↗
PubMed1979

[Bovine tuberculosis control in Lódź Province and its results].

In the years 1964--1969 the Lódź Voivodeship has been involved in the fight against the cattle tuberculosis in result of which all socialized farms have been liberated from this disease. Also, a percentage of cattle specific tuberculin reactions in individual farms has been diminished to 0.20% and the cases of tuberculosis after slaughter to 0.83%. The action had also some influence on the increase of the cattle stock. The loss has been diminished because of the sequesters of internal organs and the loss of the meat value of the animals submitted to slaughter. The fight against the tuberculosis had also an influence on the diminution of the number of the pigs and sheep infected with this disease. The course of the fight against the cattle tuberculosis conducted on the territory of the Lódź Voivodeship was dependent in some degree on its geographical place. In the administrative districts adjacent to the areas on which a great percentage of the tuberculosis was stated the course of the liquidation of this disease was slower than on the remaining terrains. Also, the action ran slower in the regions characterized by the majority of the ploughland in relation to the meadows and pastures and there where an intensive cow-shed rearing was carried out. The Lódź Voivodeship rivers, being many a time sewer ditches, did not cause the increase of the cattle morbidity. It was stated, that in the administrative districts, where the average of the animals condensation was small, the percentage of the infections with the tuberculosis at the beginning of the fighting against it was also low, however at a greater condensation of cow-shed rooms the number of infected head increased respectively. A considerable expansion of tuberculosis over the hens and also a frequent amounting to about 71% use of the cow-sheds as common rooms for the cattle, pigs and poultry caused the occurrence of cattle unspecific tuberculin reactions and led to the infections of the pigs with this disease.

Animals↗